Optimize bubble gradient background painting.

Telegram/SourceFiles/ui/chat/chat_theme.cpp

@@ -431,17 +431,20 @@ ChatPaintContext ChatTheme::preparePaintContext(
 		not_null<const ChatStyle*> st,
 		QRect viewport,
 		QRect clip) {
-	_bubblesBackground.area = viewport.size();
-	//if (!_bubblesBackgroundPrepared.isNull()
-	//	&& _bubblesBackground.area != viewport.size()
-	//	&& !viewport.isEmpty()) {
-	//	// #TODO bubbles delayed caching
-	//	_bubblesBackground = CacheBackground({
-	//		.prepared = _bubblesBackgroundPrepared,
-	//		.area = viewport.size(),
-	//	});
-	//	_bubblesBackgroundPattern->pixmap = _bubblesBackground.pixmap;
-	//}
+	const auto area = viewport.size();
+	if (!_bubblesBackgroundPrepared.isNull()
+		&& _bubblesBackground.area != area) {
+		if (!_cacheBubblesTimer) {
+			_cacheBubblesTimer.emplace([=] { cacheBubbles(); });
+		}
+		if (_cacheBubblesArea != area
+			|| (!_cacheBubblesTimer->isActive()
+				&& !_bubblesCachingRequest)) {
+			_cacheBubblesArea = area;
+			_lastBubblesAreaChangeTime = crl::now();
+			_cacheBubblesTimer->callOnce(kCacheBackgroundFastTimeout);
+		}
+	}
 	return {
 		.st = st,
 		.bubblesPattern = _bubblesBackgroundPattern.get(),
@@ -460,15 +463,15 @@ const BackgroundState &ChatTheme::backgroundState(QSize area) {
 		&& !background().gradientForFill.isNull()) {
 		// We don't support direct painting of patterned gradients.
 		// So we need to sync-generate cache image here.
-		_willCacheForArea = area;
-		setCachedBackground(CacheBackground(currentCacheRequest(area)));
+		_cacheBackgroundArea = area;
+		setCachedBackground(CacheBackground(cacheBackgroundRequest(area)));
 		_cacheBackgroundTimer->cancel();
 	} else if (_backgroundState.now.area != area) {
-		if (_willCacheForArea != area
+		if (_cacheBackgroundArea != area
 			|| (!_cacheBackgroundTimer->isActive()
 				&& !_backgroundCachingRequest)) {
-			_willCacheForArea = area;
-			_lastAreaChangeTime = crl::now();
+			_cacheBackgroundArea = area;
+			_lastBackgroundAreaChangeTime = crl::now();
 			_cacheBackgroundTimer->callOnce(kCacheBackgroundFastTimeout);
 		}
 	}
@@ -495,7 +498,7 @@ void ChatTheme::generateNextBackgroundRotation() {
 		return;
 	}
 	constexpr auto kAddRotationDoubled = (720 - 45);
-	const auto request = currentCacheRequest(
+	const auto request = cacheBackgroundRequest(
 		_backgroundState.now.area,
 		kAddRotationDoubled);
 	if (!request) {
@@ -506,7 +509,7 @@ void ChatTheme::generateNextBackgroundRotation() {
 		if (!readyForBackgroundRotation()) {
 			return;
 		}
-		const auto request = currentCacheRequest(
+		const auto request = cacheBackgroundRequest(
 			_backgroundState.now.area,
 			kAddRotationDoubled);
 		if (forRequest == request) {
@@ -518,7 +521,7 @@ void ChatTheme::generateNextBackgroundRotation() {
 	});
 }
 
-auto ChatTheme::currentCacheRequest(QSize area, int addRotation) const
+auto ChatTheme::cacheBackgroundRequest(QSize area, int addRotation) const
 -> CacheBackgroundRequest {
 	if (background().colorForFill) {
 		return {};
@@ -527,7 +530,6 @@ auto ChatTheme::currentCacheRequest(QSize area, int addRotation) const
 		.background = background(),
 		.area = area,
 		.gradientRotationAdd = addRotation,
-//		.recreateGradient = (addRotation != 0),
 	};
 }
 
@@ -535,7 +537,7 @@ void ChatTheme::cacheBackground() {
 	Expects(_cacheBackgroundTimer.has_value());
 
 	const auto now = crl::now();
-	if (now - _lastAreaChangeTime < kCacheBackgroundTimeout
+	if (now - _lastBackgroundAreaChangeTime < kCacheBackgroundTimeout
 		&& QGuiApplication::mouseButtons() != 0) {
 		_cacheBackgroundTimer->callOnce(kCacheBackgroundFastTimeout);
 		return;
@@ -545,7 +547,8 @@ void ChatTheme::cacheBackground() {
 
 void ChatTheme::cacheBackgroundNow() {
 	if (!_backgroundCachingRequest) {
-		if (const auto request = currentCacheRequest(_willCacheForArea)) {
+		if (const auto request = cacheBackgroundRequest(
+				_cacheBackgroundArea)) {
 			cacheBackgroundAsync(request);
 		}
 	}
@@ -563,8 +566,8 @@ void ChatTheme::cacheBackgroundAsync(
 		crl::on_main(weak, [=, result = CacheBackground(request)]() mutable {
 			if (done) {
 				done(std::move(result));
-			} else if (const auto request = currentCacheRequest(
-					_willCacheForArea)) {
+			} else if (const auto request = cacheBackgroundRequest(
+					_cacheBackgroundArea)) {
 				if (_backgroundCachingRequest != request) {
 					cacheBackgroundAsync(request);
 				} else {
@@ -605,6 +608,64 @@ void ChatTheme::setCachedBackground(CacheBackgroundResult &&cached) {
 		kBackgroundFadeDuration);
 }
 
+auto ChatTheme::cacheBubblesRequest(QSize area) const
+-> CacheBackgroundRequest {
+	if (_bubblesBackgroundPrepared.isNull()) {
+		return {};
+	}
+	return {
+		.background = {
+			.gradientForFill = _bubblesBackgroundPrepared,
+		},
+		.area = area,
+	};
+}
+
+void ChatTheme::cacheBubbles() {
+	Expects(_cacheBubblesTimer.has_value());
+
+	const auto now = crl::now();
+	if (now - _lastBubblesAreaChangeTime < kCacheBackgroundTimeout
+		&& QGuiApplication::mouseButtons() != 0) {
+		_cacheBubblesTimer->callOnce(kCacheBackgroundFastTimeout);
+		return;
+	}
+	cacheBubblesNow();
+}
+
+void ChatTheme::cacheBubblesNow() {
+	if (!_bubblesCachingRequest) {
+		if (const auto request = cacheBackgroundRequest(
+				_cacheBubblesArea)) {
+			cacheBubblesAsync(request);
+		}
+	}
+}
+
+void ChatTheme::cacheBubblesAsync(
+		const CacheBackgroundRequest &request) {
+	_bubblesCachingRequest = request;
+	const auto weak = base::make_weak(this);
+	crl::async([=] {
+		if (!weak) {
+			return;
+		}
+		crl::on_main(weak, [=, result = CacheBackground(request)]() mutable {
+			if (const auto request = cacheBubblesRequest(
+					_cacheBubblesArea)) {
+				if (_bubblesCachingRequest != request) {
+					cacheBubblesAsync(request);
+				} else {
+					_bubblesCachingRequest = {};
+					_bubblesBackground = std::move(result);
+					_bubblesBackgroundPattern->pixmap
+						= _bubblesBackground.pixmap;
+				}
+			}
+		});
+	});
+}
+
 rpl::producer<> ChatTheme::repaintBackgroundRequests() const {
 	return _repaintBackgroundRequests.events();
 }

Telegram/SourceFiles/ui/chat/chat_theme.h

@@ -147,12 +147,20 @@ private:
 		const CacheBackgroundRequest &request,
 		Fn<void(CacheBackgroundResult&&)> done = nullptr);
 	void setCachedBackground(CacheBackgroundResult &&cached);
-	[[nodiscard]] CacheBackgroundRequest currentCacheRequest(
+	[[nodiscard]] CacheBackgroundRequest cacheBackgroundRequest(
 		QSize area,
 		int addRotation = 0) const;
 	[[nodiscard]] bool readyForBackgroundRotation() const;
 	void generateNextBackgroundRotation();
 
+	void cacheBubbles();
+	void cacheBubblesNow();
+	void cacheBubblesAsync(
+		const CacheBackgroundRequest &request);
+	void setCachedBubbles(CacheBackgroundResult &&cached);
+	[[nodiscard]] CacheBackgroundRequest cacheBubblesRequest(
+		QSize area) const;
+
 	[[nodiscard]] style::colorizer bubblesAccentColorizer(
 		const QColor &accent) const;
 	void adjustPalette(const ChatThemeDescriptor &descriptor);
@@ -167,11 +175,16 @@ private:
 	Animations::Simple _backgroundFade;
 	CacheBackgroundRequest _backgroundCachingRequest;
 	CacheBackgroundResult _backgroundNext;
-	QSize _willCacheForArea;
-	crl::time _lastAreaChangeTime = 0;
+	QSize _cacheBackgroundArea;
+	crl::time _lastBackgroundAreaChangeTime = 0;
 	std::optional<base::Timer> _cacheBackgroundTimer;
+
 	CachedBackground _bubblesBackground;
 	QImage _bubblesBackgroundPrepared;
+	CacheBackgroundRequest _bubblesCachingRequest;
+	QSize _cacheBubblesArea;
+	crl::time _lastBubblesAreaChangeTime = 0;
+	std::optional<base::Timer> _cacheBubblesTimer;
 	std::unique_ptr<BubblePattern> _bubblesBackgroundPattern;
 
 	rpl::event_stream<> _repaintBackgroundRequests;

Telegram/SourceFiles/ui/chat/message_bubble.cpp

@@ -93,13 +93,11 @@ void PaintPatternBubble(Painter &p, const SimpleBubble &args) {
 	const auto fillBg = [&](const QRect &rect) {
 		const auto fill = rect.intersected(args.patternViewport);
 		if (!fill.isEmpty()) {
-			p.setClipRect(fill);
 			PaintPatternBubblePart(
 				p,
 				args.patternViewport,
 				pattern->pixmap,
 				fill);
-			p.setClipping(false);
 		}
 	};
 	const auto fillSh = [&](const QRect &rect) {
@@ -346,10 +344,30 @@ void PaintPatternBubblePart(
 		const QRect &viewport,
 		const QPixmap &pixmap,
 		const QRect &target) {
-	// #TODO bubbles optimizes
-	const auto to = viewport;
-	const auto from = QRect(QPoint(), pixmap.size());
-	p.drawPixmap(to, pixmap, from);
+	const auto factor = pixmap.devicePixelRatio();
+	if (viewport.size() * factor == pixmap.size()) {
+		const auto fill = target.intersected(viewport);
+		if (fill.isEmpty()) {
+			return;
+		}
+		p.drawPixmap(fill, pixmap, QRect(
+			(fill.topLeft() - viewport.topLeft()) * factor,
+			fill.size() * factor));
+	} else {
+		const auto to = viewport;
+		const auto from = QRect(QPoint(), pixmap.size());
+		const auto deviceRect = QRect(
+			QPoint(),
+			QSize(p.device()->width(), p.device()->height()));
+		const auto clip = (target != deviceRect);
+		if (clip) {
+			p.setClipRect(target);
+		}
+		p.drawPixmap(to, pixmap, from);
+		if (clip) {
+			p.setClipping(false);
+		}
+	}
 }
 
 void PaintPatternBubblePart(
@@ -392,7 +410,9 @@ void PaintPatternBubblePart(
 		QImage &cache) {
 	Expects(paintContent != nullptr);
 
-	if (cache.size() != target.size() * style::DevicePixelRatio()) {
+	const auto targetOrigin = target.topLeft();
+	const auto targetSize = target.size();
+	if (cache.size() != targetSize * style::DevicePixelRatio()) {
 		cache = QImage(
 			target.size() * style::DevicePixelRatio(),
 			QImage::Format_ARGB32_Premultiplied);
@@ -400,10 +420,15 @@ void PaintPatternBubblePart(
 	}
 	cache.fill(Qt::transparent);
 	auto q = Painter(&cache);
-	q.translate(-target.topLeft());
+	q.translate(-targetOrigin);
 	paintContent(q);
+	q.translate(targetOrigin);
 	q.setCompositionMode(QPainter::CompositionMode_SourceIn);
-	PaintPatternBubblePart(q, viewport, pixmap, target);
+	PaintPatternBubblePart(
+		q,
+		viewport.translated(-targetOrigin),
+		pixmap,
+		QRect(QPoint(), targetSize));
 	q.end();
 
 	p.drawImage(target, cache);